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99666665 = 5717191877
BaseRepresentation
bin1011111000011…
…00101011101001
320221112120221222
411330030223221
5201003313130
613520111425
72320103240
oct574145351
9227476858
1099666665
115129404a
1229465575
1317857b77
14d345957
158b3ace5
hex5f0cae9

99666665 has 32 divisors (see below), whose sum is σ = 145649664. Its totient is φ = 63912960.

The previous prime is 99666661. The next prime is 99666667. The reversal of 99666665 is 56666699.

It is a happy number.

It is not a de Polignac number, because 99666665 - 22 = 99666661 is a prime.

It is a super-2 number, since 2×996666652 = 19866888224444450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99666661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113207 + ... + 114083.

It is an arithmetic number, because the mean of its divisors is an integer number (4551552).

Almost surely, 299666665 is an apocalyptic number.

It is an amenable number.

99666665 is a deficient number, since it is larger than the sum of its proper divisors (45982999).

99666665 is a wasteful number, since it uses less digits than its factorization.

99666665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097.

The product of its digits is 3149280, while the sum is 53.

The square root of 99666665 is about 9983.3193377754. The cubic root of 99666665 is about 463.6425745850.

The spelling of 99666665 in words is "ninety-nine million, six hundred sixty-six thousand, six hundred sixty-five".

Divisors: 1 5 7 17 35 85 119 191 595 877 955 1337 3247 4385 6139 6685 14909 16235 22729 30695 74545 104363 113645 167507 521815 837535 1172549 2847619 5862745 14238095 19933333 99666665